A point charge (?5.0 ?C) is placed on the x axis at x = 4.0 cm, and a second charge (+5.0 ?C) is placed on the x axis at x = ?4.0 cm. What is the magnitude of the electric force on a third charge (+2.5 ?C) placed on the y axis at y = 3.0 cm?
a. 90 N
b. 45 N
c. 54 N
d. 72 N
e. 36 N
d
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Earth's internal layers were discovered by studying the movement of P- and S- waves through Earth's interior. In comparison to S-waves, the movement of P-waves is
A) fast, compressing and expanding the rock as they move through it. B) fast, vibrating the rock particles up and down and side-to-side. C) slower and can travel through solid granite, magma, water or air. D) slower and can travel only through solids, not liquids.
The addition of salt to water affects its
A) crystal composition. B) freezing point. C) viscosity. D) liquidity. E) none of the above
When multiplying and/or dividing quantities, you should report
a. the result rounded to the same number of digits as there are in the quantity with the greatest number of significant figures. b. all the digits that show on your calculator. c. only whole numbers. d. the result rounded to the same number of digits as there are in the quantity with the least number of significant figures.
A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?
A) upward B) northward C) southward D) eastward E) westward